pixhawk will not arm

I have a pixhawk that i was hovering one day when it just took off and hit a tree and fell about 10 foot to the street upside down, broke the GPS mask off and now the pixhawk want arm and the GPS seems to be off a little.

The pixhawk worked great before this happened, i think it took off because i did not have the latest firm ware on it.

I am not good at setting this thing up so i have no idea how to check it to see what is wrong.

Also the pixhawk was inside the quad so it did not come in contact with the street.

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